mission-critical task; core business operation
Refers to essential tasks or operations that are fundamental to an organization's functioning, often used in IT and business contexts.
This system supports mission-critical tasks.
A halt in core business operations affects the entire company.
重要業務 means 'important tasks' in a general sense, while 基幹業務 specifically refers to tasks that are fundamental and indispensable to the organization's core functions.
Compound of 基幹 (foundation, core) and 業務 (business, operations). The exact historical derivation is uncertain, but the term is widely used in modern business and IT contexts.